Grate bab



(No Model.)

J. MAILER-- GRATB BAR.

A'Patented Jan. 2 2, 1884v INVENTOR 'WITNBssEs.

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ATTORNEYS;

UNITED STATES PATENT Y OEEICE.

JOHN MAILER, OE sAN EEANCIsCO, CALIFORNIA..

SPECIFICATION forming part of Letters Patent No. 292,337, dated January 22, 1884.

i Application filed March 29, 1883. (No model.) i

To all whom, it may concern:

Be it known that I, JOHN MAILER, of San Francisco, in the county of San Francisco and State of California, have invented a new and useful Improvement in Grate-Bars, of which the following is a full, clear, and eXact description.

Reference is to be had to the accompanying drawings, forming part of this specication, in which similar letters of reference indicate cor responding parts in all the gures,

Figures l, 2, and 3 are respectively perspective and cross-sectional views ofthe gratebars. v

My invention relates to improvements in grate-bars; and it consists in the peculiar construction and arrangement of the parts, as hereinafter more fully set forth, and pointed out in the claims.

edge of the plate a2, I form the fins or tongues c2, the tongues of one side being Opposite the spaces between the tongues of the other side ofthe plate, or in transversely staggered pos'ition; and the tongues c2 are beveled `downward and inward to the plate a2, thus permitting,by their shape and relative position-with each other, a very large and free air-inlet between the plates and tongues, while presenting ample surface for the support of very fine coal or dust fires.

An important feature of my grate-bar is the concavity or groove in and along the top or fire surface of the bars, which may either be of rounded form,'as at d2, Fig. 2, or of angular form, as at e2, Fig. 3, the object of the groove vin either case being to form areceptacle along g the top of the bar, -in which ashes may lodge to protect the bar from the intense heat of the fire. llhe bars h may be connected by their spacing-blocks b2, to form double or triple bars;

or be made singly, as indicated by the central vertical dotted line of Fig. 2.

A grate-bar thus constructed is cheaply made and readily applied to or removed from the furnace, and has in practice proved unusually durable and giving most satisfactory results.

I am aware that a grate-bar provided with a series of lugs or projections on its opposite sides, so arranged that the lugs on one bar will pass through the spaces between the lugs of the adjacent bars whenthe grate-bars are vibrated or rocked on their trunnions or journals, is old, andI therefore lay no claim to such invention. In my invention the, grate-bars are xed, and no vibration or rocking motion is imparted to them, and the tongues are arranged on both sides of the opposite plates of each bar in a staggered position, and beveled downward and inward to the plates a2, for the purpose of insuring a free and large air-inlet between the plates and tongues, and not to allow of the passage of the lugs by each other in the vibrations or rocking ofthe grate-bars in the constructions disclaimed.

Having thus described my invention, I claim as newl and desire to secure by Letters Patent- 1. The fixed grate-bar composed of the parallel plates a2, provided with tongues c2 on their opposite sides, beveled downward and inward to the plates, and arranged in staggered position, substantially as shown and described.

2. The combination, ina fixed grate-bar, of the plates e2, tongues c?, beveled downward and inward tothe plates, and arranged in staggered position at Opposite sides of the plates a2, and the parallel-edged spacing-blocks b2, substan tially as shown and described.

3. The combination, in a fixed grate-bar, of the tapering plates a2., each having a recess along its upper edge, tongues c, beveled downward and. inward to the plates, and arranged in staggered position at opposite sides Aof the plates, and parallel-edged spacingblocks b, substantially as shown and described.

JOHN MAILER.

Vitnesses:

F. C. MOREBACH, P. MCARAN. 

